package cn.cvs.utils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public  class MyBatisUtil {
    private static SqlSessionFactory factory;

    static {//通过静态代码块，唯一一次创建SqlSessioinFactory实例
        try {
            InputStream is= Resources.getResourceAsStream("mybatis-config.xml");

            factory=new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            throw new RuntimeException("初始化失败",e);
        }
    }
    //创建并返回SqlSessioin实例
    public static SqlSession createSqlSession(){
        return factory.openSession(false);//关闭自动提交开启事务
    }
    //关闭SqlSession
    public static void closeSqlSession(SqlSession sqlSession){
        if (sqlSession!=null){
            sqlSession.close();
        }
    }
}
